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HP-UX Reference > F


HP-UX 11i Version 3: February 2007

Technical documentation

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fsdb — file system debugger (generic)


/usr/sbin/fsdb [-F FStype] [-o specific_options] [-V] special


Always execute the fsck command (see fsck(1M)) after running fsdb.


The fsdb command can be used to patch up a damaged file system after a crash. It is intended for experienced users only. The file system type to be debugged is specified as FStype. Each file system type has a unique structure requiring different debugging capabilities. The manual entries for the file-system-specific fsdb should be consulted before attempting any debugging or modifications.

Options and Arguments

fsdb recognizes the following options and arguments:


The file name of the special file containing the file system.

-F FStype

Specify the file system type on which to operate (see fstyp(1M) and fs_wrapper(5)). If this option is not included on the command line, then the file system type is determined from the file /etc/fstab by matching special with an entry in that file. If there is no entry in /etc/fstab, then the file system type is determined from the file /etc/default/fs.

-o specific_options

Specify suboptions specific to each file system type. specific_options is a comma-separated list of suboptions and/or keyword/attribute pairs supported by the specific FStype.


Echo the completed command line, but perform no other action. The command line is generated by incorporating the user-specified options and other information derived from the /etc/fstab file. This option allows the user to verify the command line.


Invoke the file system debugger on HFS file system /dev/disk/disk2:

fsdb -F hfs /dev/disk/disk2

Display a completed command line without executing the debugger:

fsdb -V /dev/disk/disk2

The previous command might display:

fsdb -F hfs /dev/disk/disk2


Only experienced users should use fsdb. The failure to fully understand the usage of fsdb and the file system's internal organization can lead to complete destruction of the file system and total loss of data.


fsdb was developed by HP and AT&T.



Specifies the default file system type


Static information about the file systems


fsdb: SVID3

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